|05-12-2009 07:39 PM|
|05-12-2009 04:32 PM|
|05-12-2009 04:31 PM|
|05-12-2009 03:47 PM|
|red65novawagon||We need to clarify some terms. Pinion offset is a fixed location in the differential housing center section, what everyone is talking about here is pinion centerline and yes the u-joints will accommodate a little variation but not much for long. Peace man|
|05-12-2009 03:14 PM|
Just imagine this, with the pinion centered, and the engine centered, put the whole car on a rotisserie. when you turn the car over, the angle will change from vertical to horizontal, without any relative movement. And it will work just as well at any of the angles in between. The angle doesn't change, just the orentation of the angle changes. It's still one angle.
|05-12-2009 01:01 PM|
Below is what you do not want.
I----<>----I rear end
|05-12-2009 12:43 PM|
|XNTRCI-T||enjenjo is correct. As long as the axis of the transmission output shaft and the axis of the pinion are parallel, the u-joints only see one angle no mater what the offset is.|
|05-12-2009 11:19 AM|
|red65novawagon||Get back to me when you offset it side to side then I'll just tell you I told you so.|
|05-12-2009 09:49 AM|
|05-12-2009 08:31 AM|
|red65novawagon||I've tried to explain this in the simplest posible way but some thing you just can't get across. The pinion has to be square to the out put shaft of the trans looking at it from above PERIOD. The only other way to explain this is look at the front end of GM 1/2 ton 4 wheel drive trucks, they're using CV style drive axles because U-joint simply can't articulate to accommodate two separate planes of motion. If you still don't believe me do it the other way and you'll be doing it twice! I guarantee it!|
|05-11-2009 11:42 PM|
|ericnova72||Enjenjo, you found the explanation I've been struggling to find the words to describe, you nailed it. There hasn't been a rear drive car made since the late 50's that didn't have offset both laterally and vertically.|
|05-11-2009 11:19 PM|
|enjenjo||If the driveshaft is offset to one side, that would be one angle in a vertical plane. If it's offset up and down that is one angle in a horizintal plane. If it is offset both vertically, and horizontally, it is still one angle, but at 45 degrees to both the vertical, and horizontal, and still measured the same way.|
|05-11-2009 02:22 PM|
|red65novawagon||Just 4 *****s and grins if you have a way to get your car up in the air pull the driveshaft from the rear and bring the shaft down so that it's at two different angles, when it's at two separate planes of travel and you'll quickly understand what I'm talking about.|
|05-10-2009 08:57 PM|
|enjenjo||Most rear drive GM cars have the engine offset to the right. And most of them have a centered pinion. the angle is a non issue. up and down, side to side, or at 45 degrees, as long as the angle of the joint is less than 7 degrees, and equal but opposite the angle on the second joint, there is no problem.|
|05-10-2009 04:16 PM|
A u-joint when working at an angle will have fast and slow portions of its rotation, for lack of a better term. The idea is to have these motions in phase w/each other. If there are more than one out of plane angle, it's easy to visualize how there will be problems.
Whether a 'Vette has this "two planes out of phase" is really a moot point. It is not a desirable thing, and I suspect the engineers of the 'Vette did this for reasons that are not usually encountered- and did the things necessary to quell any damaging vibes/oscillations that will result.
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